3505 Creating LU unconditionally enables write cache on backing store device
Reviewed by: Vitaliy Gusev <vitaliy.gusev@nexenta.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Ricard Lowe <richlowe@richlowe.net>